51091394 has 8 divisors (see below), whose sum is σ = 76712508. Its totient is φ = 25520560.

The previous prime is 51091393. The next prime is 51091423. The reversal of 51091394 is 49319015.

51091394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 45064369 + 6027025 = 6713^2 + 2455^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×51091394² = 5220661081726472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51091394.

It is not an unprimeable number, because it can be changed into a prime (51091393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9917 + ... + 14160.

Almost surely, 2^51091394 is an apocalyptic number.

51091394 is a deficient number, since it is larger than the sum of its proper divisors (25621114).

51091394 is a wasteful number, since it uses less digits than its factorization.

51091394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25140.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 51091394 is about 7147.8244242567. The cubic root of 51091394 is about 371.0643664522.

The spelling of 51091394 in words is "fifty-one million, ninety-one thousand, three hundred ninety-four".